>>> import re
>>> str1 = "890"
>>> lis = [89,90]
>>> for i in range(len(lis)-1, -1, -1):
    x = re.search(str(lis[i]), str1)
    print(x)


<_sre.SRE_Match object; span=(1, 3), match='90'>
<_sre.SRE_Match object; span=(0, 2), match='89'>
>>>